[w3c/manifest] [WIP] Fix color processing steps (#878)

Closes #760

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [x] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] Firefox (link to issue)
* [ ] Edge (public signal)

Commit message:

*TODO* (Fill in. If making normative changes, describe exactly what the behavioral
difference will be.)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/878

-- Commit Summary --

  * Editorial: use CSS/parse algorithm

-- File Changes --

    M index.html (42)

-- Patch Links --

https://github.com/w3c/manifest/pull/878.patch
https://github.com/w3c/manifest/pull/878.diff

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